. >> in northern virginia today romney told supporters america needs leadership in the middle east. >> right now we are in mournin mourning. we have lost 4 of our diplomat across the world. we are thinking about their families and there's they have left behind. what a tragedy. >>reporter: romney words were interrupted bay heckler but no repeat of yesterday attack on the president to the lybian violence. in golden, colorado barack obama rae response were brief and apolitical. >> there are still threats in the world and we have to remain vigilant. that's why we have to be relentless in pursuing those who attack us. >>reporter: violent protest continue to spill across the middle east. tied to film that depicts the prophet mohammad as womanizer and fraud. >> this video is disgusting and reprehensible. there is no justification, none at all for responding to this video with violence. >>reporter: in libya 4 men arrested in connection with tuesday attack that killed ambassador chris stevens. investigators say they are tracking several others. 2 u.s. war ships are now positioned nearby and on